Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
lez-
←
Welsh
llys-
(cognate)
←
Irish
leas-
(cognate)
→
Irish
leas-
(cognate)
→
Scottish Gaelic
leas-
(cognate)
→
Manx
lhiass-
(cognate)